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Which of the following is the equation of a line that passes through the point [tex][tex]$(3,2)$[/tex][/tex] and is parallel to the [tex][tex]$y$[/tex][/tex]-axis?

A. [tex]y=2[/tex]
B. [tex]x=3[/tex]
C. [tex]x=2[/tex]
D. [tex]y=3[/tex]

Sagot :

To determine the equation of a line that passes through the point [tex]\((3,2)\)[/tex] and is parallel to the [tex]\( y \)[/tex]-axis, let's carefully think through the properties of such lines.

### Step-by-Step Solution

1. Understanding the Properties of Lines Parallel to the [tex]\( y \)[/tex]-axis:
- A line that is parallel to the [tex]\( y \)[/tex]-axis has a constant [tex]\( x \)[/tex]-coordinate for all points on the line. This means that no matter what the [tex]\( y \)[/tex]-coordinate is, the [tex]\( x \)[/tex]-coordinate does not change.

2. Given Point:
- The line must pass through the point [tex]\((3,2)\)[/tex].

3. Determining the Constant [tex]\( x \)[/tex]-Value:
- Since the line is parallel to the [tex]\( y \)[/tex]-axis, it must have a constant [tex]\( x \)[/tex]-value. Given the point has an [tex]\( x \)[/tex]-value of 3, the equation will be of the form [tex]\( x = 3 \)[/tex].

4. Conclusion:
- The correct equation of the line is [tex]\( x = 3 \)[/tex].

### Answer Verification:
Let's double-check by considering the point and ensuring it fits the equation [tex]\( x = 3 \)[/tex]. For the point [tex]\((3,2)\)[/tex]:
- Substitute [tex]\( x = 3 \)[/tex]:
- It satisfies the given point because [tex]\( x \)[/tex] is indeed 3.

### Final Answer:

B. [tex]\( x=3 \)[/tex]